package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

/**
 * 消费者
 */
public class ConsumerQuickStart {

    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.200.130:9092");
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");

        KafkaConsumer<String, String> consumer = new KafkaConsumer<>(properties);

        // 绑定主题
        consumer.subscribe(Collections.singletonList("topic"));


        // 偏移量同步提交
        /*
        while (true) {
            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println(consumerRecord.key() +"---->>>"+ consumerRecord.value());

                try {
                    consumer.commitSync();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
        */

        // 偏移量异步提交
        /*ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
        for (ConsumerRecord<String, String> record : records) {
            System.out.println(record.key() + "--->" + record.value());
            try {
                consumer.commitAsync(new OffsetCommitCallback() {
                    @Override
                    public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                        if (e!=null){
                            System.out.println("记录错误的提交偏移量："+ map+",异常信息"+e);

                        }
                    }
                });
            } catch (Exception e) {
                e.printStackTrace();
            }
        }*/

        // 同步加异步提交偏移量

        try {
            while (true) {
                ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> record : records) {
                    System.out.println(record.key() + "---->>" + record.value());
                }
                consumer.commitAsync();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                consumer.commitSync();
            } finally {
                consumer.close();
            }
        }



    }

}